[docs] [issue12211] Better document math.copysign behavior.

[Roundup Robot]

Roundup Robot added the comment:

New changeset b01f4ed077fa by Andrew Kuchling in branch '3.3':
#12211: remove paragraph about NaNs
http://hg.python.org/cpython/rev/b01f4ed077fa

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<http://bugs.python.org/issue12211>
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